<?php

namespace my;
class wechatAppPay
{
//接口API URL前缀
	const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
//下单地址URL
	const UNIFIEDORDER_URL = "/pay/unifiedorder";
//查询订单URL
	const ORDERQUERY_URL = "/pay/orderquery";
//关闭订单URL
	const CLOSEORDER_URL = "/pay/closeorder";
//申请退款URL
	const REFUND_URL = "/secapi/pay/refund";
//退款查询URL
	const REFUNDQUERY_URL = "/pay/refundquery";
//公众账号ID
	private $appid;
//商户号
	private $mch_id;
//随机字符串
	private $nonce_str;
//签名
	private $sign;
//商品描述
	private $body;
//商户订单号
	private $out_trade_no;
//支付总金额
	private $total_fee;
//退款金额
	private $refund_fee;
//退款单号
	private $out_refund_no;
//终端IP
	private $spbill_create_ip;
//支付结果回调通知地址
	private $notify_url;
//交易类型
	private $trade_type;
//支付密钥
	private $key;
//证书路径
	private $SSLCERT_PATH;
	private $SSLKEY_PATH;
//所有参数
	private $params = array();

	public function __construct($appid, $mch_id, $notify_url, $key,$cert_path='',$key_path='')
	{
		$this->appid = $appid;
		$this->mch_id = $mch_id;
		$this->notify_url = $notify_url;
		$this->key = $key;
		$cert_path&&$this->SSLCERT_PATH = $cert_path;
		$key_path&&$this->SSLKEY_PATH = $key_path;
	}

	/**
	 * 下单方法
	 * @param $params //下单参数
	 * @return  boolean|array
	 * @throws WxPayException
	 */
	public function unifiedOrder($params)
	{
		$this->body = $params['body'];
		$this->out_trade_no = $params['out_trade_no'];
		$this->total_fee = $params['total_fee'];
		$this->trade_type = $params['trade_type'];
		$this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];

		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['body'] = $this->body;
		$this->params['out_trade_no'] = $this->out_trade_no;
		$this->params['total_fee'] = $this->total_fee;
		$this->params['spbill_create_ip'] = $this->spbill_create_ip;
		$this->params['notify_url'] = $this->notify_url;
		$this->params['trade_type'] = $this->trade_type;
		$params['attach'] && $this->params['attach'] = $params['attach'];
		//获取签名数据
		$this->sign = $this->MakeSign($this->params);
		$this->params['sign'] = $this->sign;
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::UNIFIEDORDER_URL);
		if (!$response) {
			return false;
		}
		$result = $this->xml_to_data($response);
		if (!empty($result['result_code']) && !empty($result['err_code'])) {
			$result['err_msg'] = $this->error_code($result['err_code']);
		}
		return $result;
	}
	/**
	 * 小程序下单方法
	 * @param $params //下单参数
	 * @return  boolean|array
	 * @throws WxPayException
	 */
	public function xiaochengxu_unifiedOrder($params)
	{
		$this->body = $params['body'];
		$this->out_trade_no = $params['out_trade_no'];
		$this->total_fee = $params['total_fee'];
		$this->trade_type = $params['trade_type'];
		//******小程序的openid
		$this->openid = $params['openid'];
		$this->spbill_create_ip = $_SERVER['REMOTE_ADDR'];
		//******小程序的openid
		$this->params['openid'] = $this->openid;
		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['body'] = $this->body;
		$this->params['out_trade_no'] = $this->out_trade_no;
		$this->params['total_fee'] = $this->total_fee;
		$this->params['spbill_create_ip'] = $this->spbill_create_ip;
		$this->params['notify_url'] = $this->notify_url;
		$this->params['trade_type'] = $this->trade_type;
		$params['attach'] && $this->params['attach'] = $params['attach'];
		//获取签名数据
		$this->sign = $this->MakeSign($this->params);
		$this->params['sign'] = $this->sign;
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::UNIFIEDORDER_URL);
		if (!$response) {
			return false;
		}
		$result = $this->xml_to_data($response);
		if (!empty($result['result_code']) && !empty($result['err_code'])) {
			$result['err_msg'] = $this->error_code($result['err_code']);
		}
		return $result;
	}
	/**
	 * 查询订单信息
	 * @param $out_trade_no //订单号
	 * @return array|boolean
	 * @throws WxPayException
	 */
	public function orderQuery($out_trade_no)
	{
		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['out_trade_no'] = $out_trade_no;
		//获取签名数据
		$this->sign = $this->MakeSign($this->params);
		$this->params['sign'] = $this->sign;
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::ORDERQUERY_URL);
		if (!$response) {
			return false;
		}
		$result = $this->xml_to_data($response);
		if (!empty($result['result_code']) && !empty($result['err_code'])) {
			$result['err_msg'] = $this->error_code($result['err_code']);
		}
		return $result;
	}

	/**
	 * 关闭订单
	 * @param $out_trade_no //订单号
	 * @return array|false
	 * @throws WxPayException
	 */
	public function closeOrder($out_trade_no)
	{
		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['out_trade_no'] = $out_trade_no;
		//获取签名数据
		$this->sign = $this->MakeSign($this->params);
		$this->params['sign'] = $this->sign;
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::CLOSEORDER_URL);
		if (!$response) {
			return false;
		}
		$result = $this->xml_to_data($response);
		return $result;
	}

	/**
	 * 申请退款
	 * @param  array
	 * @return  string|array|boolean
	 * @throws WxPayException
	 */
	public function refund($params)
	{
		if(empty($this->SSLCERT_PATH)||empty($this->SSLKEY_PATH)){
			return false;
		}
		$this->out_trade_no = $params['out_trade_no'];
		$this->out_refund_no = $params['out_refund_no'];
		$this->total_fee = $params['total_fee'];
		$this->refund_fee = $params['refund_fee'];

		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['out_trade_no'] = $this->out_trade_no;
		$this->params['out_refund_no'] = $this->out_refund_no;
		$this->params['total_fee'] = $this->total_fee;
		$this->params['refund_fee'] = $this->refund_fee;
		//获取签名数据
		$this->params['sign'] = $this->MakeSign($this->params);
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::REFUND_URL,true);
		if (!$response) {
			return $response;
		}
		$result = $this->xml_to_data($response);
		if (!empty($result['result_code']) && !empty($result['err_code'])) {
			$result['err_msg'] = $this->error_code($result['err_code']);
		}
		return $result;
	}

	/**
	 * 退款查询
	 * @param  array
	 * @return  string|array|boolean
	 * @throws WxPayException
	 * */
	public function refundQuery($params)
	{
		$this->params['appid'] = $this->appid;
		$this->params['mch_id'] = $this->mch_id;
		$this->params['nonce_str'] = $this->genRandomString();
		$this->params['out_refund_no'] = $params['out_refund_no'];
		$this->params['sign'] = $this->MakeSign($this->params);
		$xml = $this->data_to_xml($this->params);
		$response = $this->postXmlCurl($xml, self::API_URL_PREFIX . self::REFUNDQUERY_URL);
		if (!$response) {
			return $response;
		}
		$result = $this->xml_to_data($response);
		if (!empty($result['result_code']) && !empty($result['err_code'])) {
			$result['err_msg'] = $this->error_code($result['err_code']);
		}
		return $result;
	}

	/**
	 * 获取支付结果通知数据
	 * return array
	 */
	public function getNotifyData()
	{
		//获取通知的数据
		$xml = $GLOBALS['HTTP_RAW_POST_DATA'];
		$data = array();
		if (empty($xml)) {
			return false;
		}
		$data = $this->xml_to_data($xml);
		if (!empty($data['return_code'])) {
			if ($data['return_code'] == 'FAIL') {
				return false;
			}
		}
		return $data;
	}

	/**
	 * 接收通知成功后应答输出XML数据
	 *
	 */
	public function replyNotify()
	{
		$data['return_code'] = 'SUCCESS';
		$data['return_msg'] = 'OK';
		$xml = $this->data_to_xml($data);
		echo $xml;
		die();
	}

	/**
	 * 生成APP端支付参数
	 * @param $prepayid //预支付id
	 * @return  array //预支付id
	 */
	public function getAppPayParams($prepayid)
	{
		$data['appid'] = $this->appid;
		$data['partnerid'] = $this->mch_id;
		$data['prepayid'] = $prepayid;
		$data['package'] = 'Sign=WXPay';
		$data['noncestr'] = $this->genRandomString();
		$data['timestamp'] = time();
		$data['sign'] = $this->MakeSign($data);
		return $data;
	}
	/**
	 * 生成APP端支付参数
	 * @param $prepayid //预支付id
	 * @return  array //预支付id
	 */
	public function getAppPayParams_xiaochengxu($prepayid)
	{
		$data['appId'] = $this->appid;
		$data['timeStamp'] = time();
		$data['nonceStr'] = $this->genRandomString();
		//$data['partnerid'] = $this->mch_id;
		$data['package'] = 'prepay_id='.$prepayid;
		$data['signType'] = 'MD5';
		$data['sign'] = $this->MakeSign($data);
		return $data;
	}
	/**
	 * 生成签名
	 * @param $params
	 * @return string
	 */
	public function MakeSign($params)
	{
		//签名步骤一：按字典序排序数组参数
		ksort($params);
		$string = $this->ToUrlParams($params);
		//签名步骤二：在string后加入KEY
		$string = $string . "&key=" . $this->key;
		//签名步骤三：MD5加密
		$string = md5($string);
		//签名步骤四：所有字符转为大写
		$result = strtoupper($string);
		return $result;
	}

	/**
	 * 将参数拼接为url: key=value&key=value
	 * @param $params
	 * @return string
	 */
	public function ToUrlParams($params)
	{
		$string = '';
		if (!empty($params)) {
			$array = array();
			foreach ($params as $key => $value) {
				$array[] = $key . '=' . $value;
			}
			$string = implode("&", $array);
		}
		return $string;
	}

	/**
	 * 输出xml字符
	 * @param $params //参数名称
	 * @return string 返回组装的xml
	 **/
	public function data_to_xml($params)
	{
		if (!is_array($params) || count($params) <= 0) {
			return false;
		}
		$xml = "<xml>";
		foreach ($params as $key => $val) {
			if (is_numeric($val)) {
				$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
			} else {
				$xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
			}
		}
		$xml .= "</xml>";
		return $xml;
	}

	/**
	 * 将xml转为array
	 * @param string $xml
	 * @return array|boolean
	 */
	public function xml_to_data($xml)
	{
		if (!$xml) {
			return false;
		}
		//将XML转为array
		//禁止引用外部xml实体
		libxml_disable_entity_loader(true);
		$data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
		return $data;
	}

	/**
	 * 获取毫秒级别的时间戳
	 */
	private static function getMillisecond()
	{
		//获取毫秒的时间戳
		$time = explode(" ", microtime());
		$time = $time[1] . ($time[0] * 1000);
		$time2 = explode(".", $time);
		$time = $time2[0];
		return $time;
	}

	/**
	 * 产生一个指定长度的随机字符串,并返回给用户
	 * @param  $len //产生字符串的长度
	 * @return string 随机字符串
	 */
	private function genRandomString($len = 32)
	{
		$chars = array(
			"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
			"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
			"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
			"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
			"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
			"3", "4", "5", "6", "7", "8", "9"
		);
		$charsLen = count($chars) - 1;
		// 将数组打乱
		shuffle($chars);
		$output = "";
		for ($i = 0; $i < $len; $i++) {
			$output .= $chars[mt_rand(0, $charsLen)];
		}
		return $output;
	}

	/**
	 * 以post方式提交xml到对应的接口url
	 * @param string $xml 需要post的xml数据
	 * @param string $url url
	 * @param bool $useCert 是否需要证书，默认不需要
	 * @param int $second url执行超时时间，默认30s
	 * @throws WxPayException
	 * @return  boolean|array
	 */
	private function postXmlCurl($xml, $url, $useCert = false, $second = 30)
	{
		$ch = curl_init();
		//设置超时
		curl_setopt($ch, CURLOPT_TIMEOUT, $second);
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);//严格校验2
		//设置header
		curl_setopt($ch, CURLOPT_HEADER, FALSE);
		//要求结果为字符串且输出到屏幕上
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		if ($useCert == true) {
			//设置证书
			//使用证书：cert 与 key 分别属于两个.pem文件
			curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');
			curl_setopt($ch,CURLOPT_SSLCERT, $this->SSLCERT_PATH);
			curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');
			curl_setopt($ch,CURLOPT_SSLKEY, $this->SSLKEY_PATH);
		}
		//post提交方式
		curl_setopt($ch, CURLOPT_POST, TRUE);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
		//运行curl
		$data = curl_exec($ch);
		//返回结果
		if ($data) {
			curl_close($ch);
			return $data;
		} else {
			$error = curl_errno($ch);
			curl_close($ch);
			return $error;
		}
	}

	/**
	 * 错误代码
	 * @param $code //服务器输出的错误代码
	 * @return string
	 */
	public function error_code($code)
	{
		$errList = array(
			'NOAUTH' => '商户未开通此接口权限',
			'NOTENOUGH' => '用户帐号余额不足',
			'ORDERNOTEXIST' => '订单号不存在',
			'ORDERPAID' => '商户订单已支付，无需重复操作',
			'ORDERCLOSED' => '当前订单已关闭，无法支付',
			'SYSTEMERROR' => '系统错误!系统超时',
			'APPID_NOT_EXIST' => '参数中缺少APPID',
			'MCHID_NOT_EXIST' => '参数中缺少MCHID',
			'APPID_MCHID_NOT_MATCH' => 'appid和mch_id不匹配',
			'LACK_PARAMS' => '缺少必要的请求参数',
			'OUT_TRADE_NO_USED' => '同一笔交易不能多次提交',
			'SIGNERROR' => '参数签名结果不正确',
			'XML_FORMAT_ERROR' => 'XML格式错误',
			'REQUIRE_POST_METHOD' => '未使用post传递参数 ',
			'POST_DATA_EMPTY' => 'post数据不能为空',
			'NOT_UTF8' => '未使用指定编码格式',
		);
		if (array_key_exists($code, $errList)) {
			return $errList[$code];
		}
	}
}
